Ltd Run colours are manufactured in extremely small quantities and might not be repeated again so the advice is always to buy as much as you can if you like it.

Siren is described as a "transparent green"

Testers reported "This is a total success! Siren is indistinguishable from Aloe Juice. It does bubble a little if you get it too hot but so did Aloe Juice. Siren is a perfect transparent green, not too yellow not too blue and not too pale "